Tim Lexen has a nice post about one arc tiles for tessellation.
I was particularly interested in the lenses. I probably need to make more of them, but this is a start.
Getting to Know GeoGebra
Quiz: Graphing Rational Functions (Transformations Included)
Mean, Median, Mode, Range: Quick Check
Open Middle: Basic Statistics Exercise (1)
Graphs Involving Absolute Value
Critical Number HL